Hi Rocketman - you ask very relevant questions for the rides you are considering.  Awesome ride plan too!  Very beautiful country.  I concur with the other poster.  The Rincon trail south of Packsaddle turnoff is more hiking up relatively unmaintained trail.  Whiskey Flat may be a more enjoyable option out of Fairview.  It has one big hike bike in the middle, and is a bit brushy at the upper end, but very beautiful with views of the river here and there.  The riding is pretty rocky technical with lots of ups and downs in and out of drainages all the way down to Kernville.  Take lots of water and/or a filter if the temps are up!